Toronto, ON – August 29, 2017 – Sierra Metals Inc. (TSX: SMT) (BVL: SMT) (NYSE AMERICAN: SMTS) (“Sierra Metals” or “the Company”) today announced results from the expanded drilling program completed at the Santa Rosa de Lima zone located adjacent to current operations within the Cusihuiriachic (“Cusi”) property, Chihuahua state, Mexico. The completion of this drilling program will now provide the necessary data to update the past mineral resource report and provide the Company with potential future mineable resources.